fix(ios): dismiss Modal from presenting VC to handle presented view controllers

[lodev09]

Summary:

When a Modal has another view controller presented on top of it (e.g., a sheet using UISheetPresentationController), calling dismissViewControllerAnimated: on the modal itself only dismisses the topmost presented view controller, leaving the modal in an inconsistent state where it remains presented but its React content is unmounted—resulting in a blank screen.

This fix dismisses from the presenting view controller instead, which correctly dismisses the entire presentation chain including any view controllers presented on top of the modal.

This issue affects any library that presents view controllers on top of RN Modal, such as @lodev09/react-native-true-sheet.

Changelog:

[iOS] [Fixed] - Modal now correctly dismisses when another view controller is presented on top of it

Test Plan:

1. Present a React Native <Modal>
2. Present another view controller on top of it (e.g., a sheet)
3. Set the Modal's visible prop to false

Expected: Both the sheet and modal dismiss, returning to the original screen
Actual: The sheet dismisses but the modal remains presented with blank/black content

Before

before.mov

After

after.mov

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[lodev09]

CLA signed

[meta-cla]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Meta Open Source project. Thanks!

[migueldaipre]

Same as #54858 ?

[lodev09]

@migueldaipre indeed, my bad. I'll leave it here regardless.